Ok, I really hope this doesnt sound to stupid and makes sense....OK...my tank is next to my window in my room and doesnt have a hood. My 4 48" bubls just kinda hang ova the tank...so the problem is this, with these bulbs it evaps alot of water and with it being next to my window, i think that its causing condensation on the window which in the is causing mold....or so i think...thats my question could the water be evaping and causing the window to build on w/ condensation? with this much wattage do i need a lens hood that catches this condensation? is this even what causing it?! PARADOX! if yuo guys can let me know whatcha think